Orientational probing of multilayer 2-mercaptobenzoxazole through NEXAFS: An experimental and theoretical study

Citation
V. Carravetta et al., Orientational probing of multilayer 2-mercaptobenzoxazole through NEXAFS: An experimental and theoretical study, J PHYS CH A, 103(24), 1999, pp. 4641-4648
Citations number
25
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF PHYSICAL CHEMISTRY A
ISSN journal
10895639 → ACNP
Volume
103
Issue
24
Year of publication
1999
Pages
4641 - 4648
Database
ISI
SICI code
1089-5639(19990617)103:24<4641:OPOM2T>2.0.ZU;2-T
Abstract
Near edge X-ray absorption fine structure (NEXAFS) spectra of 2-mercaptoben zoxazole have been investigated from experimental and theoretical points of view, The 2-mercaptobenzoxazole molecule presents an interesting case for NEXAFS, with its aromatic, benzene-like, fragment and its heteroatom-rich p art, containing C, N, O, and S atoms. NEXAFS spectra of a 2-mercaptobenzoxa zole multilayer on Pt(111) at the carbon, nitrogen, and oxygen K-edges and at the sulphur L-edge have been recorded at normal and grazing incidence an gles of the photon beam with respect to the surface. The C, N, and O K-edge spectra exhibit angular dependence in the pi* resonance region, indicating a mean orientation of the molecules on the surface. The angle between the molecular plane and the surface has been found to be about 48 degrees. The experimental data are discussed by comparison with static-exchange (STEX) a b initio calculations for the different edges. Good agreement is observed b etween experiment and theory, allowing for a detailed discussion and attrib ution of the various features observed. A vibrational progression at the C K-edge is also identified in the highly resolved experimental spectrum.